DE102006030951B3 - Apparatus for producing metal composite pipes - Google Patents

Abstract

The device for manufacturing composite metal pipes, comprises a tape feed (2), a base frame work (1), a stripping device (3) arranged on the frame work, an interior pipe extrusion tool (4) adjacently arranged opposite to the fabrication direction with a compressed gas inlet (5) leading into the middle of the pipe, a welding device adjacently arranged in fabrication direction of the stripping device, and/or form stabilization device arranged in the fabrication direction towards the welding device. A calibration sleeve is arranged between the stripping device and the stabilization device. The device for manufacturing composite metal pipes, comprises a tape feed (2), a base frame work (1), a stripping device (3) arranged on the frame work, an interior pipe extrusion tool (4) adjacently arranged opposite to the fabrication direction with a compressed gas inlet (5) leading into the middle of the pipe, a welding device adjacently arranged in fabrication direction of the stripping device, and/or form stabilization device arranged in the fabrication direction towards the welding device. A calibration sleeve is arranged between the stripping device and the stabilization device in the area of the welding device. A calibration head of the interior pipe extrusion tool exists itself before the calibration sleeve. A compressed gas outlet passing through the calibration sleeve and the calibration head protrudes up to the area of the stabilization device. The interior pipe extrusion tool is formed as a combined interior pipe extrusion tool with an interior pipe binding unit and an interior pipe extrusion unit arranged on the extrusion tool. A sheathing tool is arranged in fabrication direction adjoining to the stabilization device and is formed as combined sheathing tool with an external pipe binding unit and an external pipe extrusion unit connected to the sheathing tool.

Description

The The invention relates to a device for producing metal composite pipes according to the preamble of claim 1.

in the State of the art for the production of metal composite pipes two of each other in principle different variants described above.

at The first variant is an inner plastic layer immediately after welding of the metal tube extruded into the metal tube inside.

It is, as for example in the WO 00 44546 A1 described above, first preformed an aluminum strip into a tube and then fed to a combined extrusion and welding device.

In this combined extrusion and welding device, the tube is finished molded, welded directly to the inner tube extrusion tool, immediately after the welding of the aluminum tube on the inner tube extrusion tool by means of this in the aluminum tube, a bonding agent and (on this) a plastic layer is attached. For this purpose, four extruders are usually arranged on a central extrusion tool. Also in the DE 10022823 A1 A method using a first variant for producing a multilayer composite pipe is presented.

All working according to this first variant working solutions above the following disadvantages.

As a result welding of the metal tube on the (inner tube) extrusion die becomes this extrusion die at the weld inevitably strongly overheated at certain points.

This overheating but leads also to an undesirable irregular overheated of the plastic in the area of the weld with inevitably resulting quality losses the coating.

moreover but leads this production-related punctual overheating of the inner tube extrusion tool in the area of the weld often in continuous operation then to a "burn through" of the inner tube extrusion tool, i.e. to destroy the Inner tube extrusion die.

hereby are very high costs caused on the one hand from the tooling costs on the other hand result on the production stop and the repair work is due.

In the EP 0581208 A1 a further apparatus for the continuous production of a multilayer composite pipe according to the former variant is presented.

at this solution but comes as a welding process Ultrasonic welding is used.

These welding processes Although somewhat reduces the point overheating of Innenrohrextrusionswerkzeuges in the area of the weld, however allows (without a massive loss of quality) only one over another welding processes severely limited Production speed.

When in the EP 0581208 A1 proposed solution, however, the simultaneous exit of the bonding agent and the plastic inevitably leads to insufficient adhesion between the aluminum tube and the / the plastic layers.

With an increase the production speed would This lack too disproportionately strengthen.

Further Disadvantages of these designs according to variant 1 are that due to the very compact extrusion heads a cost-effective control the weld quality as well An effective control of the coating quality is not possible.

moreover leads the Construction of the extrusion heads always to relatively long flow channels which then inevitably high pressures and require long dwell times in the tool. Especially at The processing of PE-Xb materials also contributes to high quality losses.

Furthermore allows the compact construction of the extruder inevitably no optimal Installation position, so that accessibility in case of material change or malfunction only conditionally possible which also greatly increases the maintenance effort.

The other, the second variant for the production of multilayer composite pipes, for example, in the DE 43 04 717 A1 , of the DE 43 23 838 B4 , of the DE 195 36 698 C1 but also in the WO 01/43 894 A1 described above.

at this second variant is first extruded a single-walled plastic tube, cooled, withdrawn with a trigger and wound up or directly after deduction directly a second Plant for further processing, i. supplied to the sheathing.

In This second attachment will depend on that of the reel or the trigger this second plant from the outside supplied Plastic pipe applied a bonding agent.

following a metal tube is made from a strip, for example a Copper or aluminum tube around the plastic tube shaped and subsequently soldered or welded becomes.

Subsequently, this metal tube thus formed is pressed against the coated with adhesion promoter inner plastic tube, or the inner plastic tube is such as in the WO 01/43 894 A1 previously described pressed against the inside of the metal tube, wherein for connection of the metal tube with the inner tube made of plastic, the adhesion promoter arranged between the two tubes is activated by heating.

This such inside coated metal tube can then again with a Adhesion promoter from the outside coated and subsequently provided with an outer plastic layer become.

These Variant for producing a metal composite pipe is due to the many steps, the big one Space requirement of the production line and the associated high equipment costs very expensive.

moreover become in this this second variant of the production of multi-layer composite pipe special very expensive adhesion promoter needed.

Yet can when welding the applied on the plastic inner tube adhesive layer but also the plastic inner tube will be damaged.

Furthermore requires calibrating the aluminum tube (on the inner tube), as well as the reactivation of the bonding agent in addition to a high apparatus Effort also very high energy costs.

The The object of the invention is now a novel device to develop the production of metal composite pipes, which the eliminates the above-mentioned disadvantages of the prior art and it allows Metal composite pipes with minimized technical and energetic Effort in high quality and with high production speed to produce at minimized Manufacturing costs, i. a minimum of equipment and when using cheaper Adhesion promoters and minimized space requirements with minimized Energy and maintenance costs a high quality of the finished product to ensure and also a long life of the inner tube extrusion tools while avoiding downtime caused by downtime, as well as a maintenance-oriented optimal solution in no time Time with minimal effort the production line on each other to convert to pipe dimension and thereby a cost minimized To allow nominal diameter change.

According to the invention this Task by means of a device for producing metal composite pipes solved according to the features of the main claim of the invention.

According to the invention, the device for the production of metal composite pipes ( 15 ) from a tape feed ( 2 ), a base frame ( 1 ), one on the base frame ( 1 ) arranged strip molding device ( 3 ) and one or more of these opposed to the manufacturing direction adjacent / arranged Innenrohrextrusionswerkzeug / en ( 4 ) with a leading into the tube center compressed gas supply ( 5 ) as well as one in the production direction of the strip forming device ( 3 ) adjacent welding device ( 6 ) and one in the production direction after the welding device ( 6 ) arranged shape stabilization device ( 7 ), which is characterized in that between the belt forming device ( 3 ) and the shape stabilization device ( 7 ) in the area of the welding device ( 6 ) a calibration sleeve ( 8th ), wherein the calibration head ( 9 ) of the inner tube extrusion tool ( 4 ) in front of the calibration sleeve ( 8th ) and the at the calibration head ( 9 ) arranged compressed gas outlet ( 10 ) inwardly through the calibration sleeve to almost the area of the shape stabilization device ( 7 protrudes.

By means of the inner tube extrusion tool ( 4 ) According to the invention a on the outer circumference with adhesion promoter ( 11 ) coated plastic pipe ( 12 ) in the after the inner tube extrusion tool ( 4 ) according to the invention arranged calibration sleeve ( 8th ) extruded into it.

In the interior of this calibration sleeve according to the invention ( 8th ) is now the diameter and the ovality of the extruded plastic tube ( 12 ) calibrated to one of the respective to be manufactured nominal size corresponding measure.

At the same time but on the outer jacket of the calibration sleeve according to the invention ( 8th ) formed the metal strip is formed into a tube and on the calibration ( 8th ) welded. In this case, the tube, for example by means of an electrode welding system or a laser welding system blunt, but also welded with these or other welding processes are welded, are.

Now that the metal band ( 13 ) to a Metal pipe ( 14 ) and on the calibration sleeve ( 8th ), this is done with a bonding agent ( 12 ) coated within the calibration sleeve according to the invention ( 8th ) calibrated plastic pipe ( 11 ) which now in the manufacturing direction, the interior of the calibration ( 8th ) leaves directly into the outer jacket of the calibration sleeve ( 8th ) welded in the direction of production leaving the same production speed welded metal pipe ( 14 ) introduced.

With the aid of pressurized gas (for example compressed air) which according to the invention after the calibration sleeve ( 8th ) arranged compressed gas outlet ( 10 ) in the interior of the plastic tube ( 11 ) is now the plastic pipe ( 11 ) from the inside to the metal tube ( 14 ) pressed.

It now comes to a reaction between the plastic pipe ( 11 ) and the metal tube ( 14 ) arranged adhesion promoter ( 12 ) whereby the plastic pipe is firmly connected to the metal pipe via the adhesive layer.

following can be prepared according to the invention Metal composite pipe in one for it suitable cooling section cooled, or coated with other plastic layers and then in cooled appropriately become.

In addition to the described advantages of the arrangement according to the invention, further essential advantages of the arrangement of a calibration sleeve according to the invention are in particular that the inner tube extrusion tool ( 4 ) no wear due to the welding of the metal tube ( 14 ) is subjected.

In the prior art, the inner tube extrusion tool ( 4 ) due to the on the inner tube extrusion tool ( 4 ) carried out after about one or two emergency stop situations such that each of the inner tube extrusion tool ( 4 ) must be completely replaced.

Since the calibration sleeve according to the invention ( 8th ) can be manufactured separately and also from any suitable available in the prior art for such components available material, by means of this separate calibration sleeve ( 8th ) not only an optimal and fast interchangeability, but at the same time a high resistance to the calibration sleeve ( 8th ) and as quickly as possible over the entire circumference of the calibration ( 8th ) to be distributed to be distributed welding heat energy.

Due to their simple design according to the invention the calibration sleeve ( 4 ) In addition, very inexpensive to manufacture.

However, even with a (for example due to a variety of emergency stop situations) still found wear of the calibration sleeve according to the invention ( 8th ), this can be replaced with little effort in the context of preventive maintenance, without (as currently common in the art, unfortunately) only after the unforeseen total failure of the system a change of the complete inner tube extrusion tool ( 4 ) is carried out.

In addition, the already mentioned very good distribution of the heat energy supplied in the welding process in the calibration sleeve according to the invention ( 8th ), that waste heat of the welding process quickly and fairly evenly in the calibration ( 8th ) and thus distributed around it, thereby the bonding agent on the entire circumference of the plastic tube ( 11 ) "Heated" and thus substantially to a uniform reaction between the plastic pipe ( 11 ) and metal tube ( 14 ) arranged adhesion promoter ( 12 ) contributes.

Since the bonding agent ( 12 ) as already explained by the calibration sleeve according to the invention ( 8th ) is introduced optimally tempered in the hot-bonding process between the layers to be joined, also has the bonding agent ( 12 ) due to the arrangement of the calibration sleeve according to the invention ( 8th ) are not activated in the meantime with great effort as in other methods for the production of metal composite pipes.

Thereby is by means of the inventive arrangement Moreover, with minimized energy costs an optimal connection between achieved the plastic tube and the metal tube.

In addition, due to the rapid and even distribution of the welding energy in (and by) the calibration sleeve according to the invention ( 8th ) not only protects the adhesion promoter from overheating and at the same time optimally tempered to the "reaction" of the bonding agent but also also protects the plastic pipe itself from a partial overheating.

By the application of the solution according to the invention also the life of the inner tube extrusion tool ( 4 ) compared to the inner tube extrusion tools conventionally used in the production of metal composite tubes (on which the metal tube has been welded) are substantially increased because the solution according to the invention, the "direct production" of the plastic inner tube has been completely disconnected from the welding process.

It should be emphasized that the life of the calibration sleeve according to the invention ( 8th ) too which also exceeds the lifetime of the inner tube extrusion tools previously used in the art by a multiple and already alone by the downtime and downtime are already significantly reduced.

Due to the separate arrangement of the inner tube extrusion tool ( 4 ) in front of the calibration sleeve ( 8th ) In addition to the advantages already mentioned also at the same time easy handling during assembly, disassembly and maintenance work guaranteed.

As a result of the invention on the calibration head ( 9 ) arranged compressed gas outlet ( 10 ) which penetrates inside the calibration sleeve into the shape stabilizing device ( 16 protruding as already explained causes the adhesive-coated plastic pipe ( 11 ) with the metal tube with ( 14 ) Help compressed air or special gas over the entire surface and also pressed evenly.

The in this area of the plant on the outer shell of the metal tube ( 14 ) arranged shape stabilization device ( 7 ) prevents a change in diameter.

simultaneously allows This arrangement also provides an immediate leak test of Weld.

The invention, directly the strip forming device ( 3 ) adjacent arrangement of the calibration sleeve ( 8th ) with this calibration sleeve ( 8th ) in the manufacturing direction adjacent arrangement of a shape stabilization device ( 7 ) also ensures the production and introduction of the plastic pipe in a metal tube on the shortest production line, so that the length of the entire system significantly shortened.

As a result of the inventive introduction of the plastic tube ( 11 ) in the smallest space in the metal tube ( 14 ) Compared to the prior art and various very energy-consuming processes, such as the reactivation of the bonding agent (by inductive heating), the removal (additional Rohrabzug), the intermediate cooling (other cooling equipment) of the plastic pipe, etc, which in addition to a reduction in energy costs also a high saving on maintenance and repair costs is achieved.

simultaneously but also the base of the Plant, i. their space requirements significantly reduced thereby further Costs, such as the cost of producing the structural Case saved become. About that In addition, the production is centralized, the operation and Handling of the system improved and, for example, operating errors avoided.

on the other hand Also, the handling of the manufacturing process is improved and For example, allows a faster nominal diameter change. In summary can thus be found that succeeded by means of the inventive solution is a device for the production of metal composite pipes too which develop the disadvantages of the current state of the art avoids and makes it possible Metal composite pipes with minimized technical and energetic Effort in high quality and produce at high production speed, the Plant itself also in the shortest time Time and with minimal effort on every other pipe dimension to be produced can be changed so that with minimal effort a wide assortment width in equally high Quality produced, In addition, the reject rate can be significantly reduced.

It is also advantageous in this connection that as inner tube extrusion tool ( 4 ) a combined inner tube extrusion tool ( 4 ) with an inner tube bonding unit ( 16 ) and also on the combined inner tube extrusion tool ( 4 ) arranged Innenrohrextrudereinheit ( 17 ) is used.

Such a combined inner tube extrusion tool ( 4 On the one hand reduces the required length of the production line for producing a stable plastic pipe coated with a primer layer and also shortens the flow channels with all the resulting benefits such as a reduction of the parts to be heated line, reducing the working pressures but also a reduction of Residence times of the plastics in the inner tube extrusion tool ( 4 ).

At the same time, such a combined inner tube extrusion tool ( 4 ) again the assembly and disassembly effort, for example, when changing the nominal diameter of the manufactured on the production line metal composite pipes.

In an advantageous embodiment of the solution according to the invention, the shape stabilizing device ( 7 ) adjacent one another in the production direction one or more sheathing tools 18 ). This makes it possible, even with an outer plastic coating provided metal composite pipe ( 15 ) with minimum energy input and thereby to ensure an optimal composite of the individual layers of the metal composite pipe as well as a simple and quick change of each to be manufactured nominal widths.

Furthermore, it is advantageous, although the sheathing tool ( 18 ) as a combined cladding tool ( 18 ) with a connected to this Außenrohrhaftvermittlereinheit ( 19 ) and an outer tube extruder unit ( 20 ), thereby again very short flow channels from the extruder to the respective sheathing tool ( 18 ) with all the already used in connection with the use of a combined inner tube extrusion tool ( 4 ) advantages are realized.

To cooling is prepared according to the invention Metal composite pipe with company-specific data and example with the current meter length Subsequently, the metal composite pipe produced in this way is then produced to the respectively desired Cut length and either wound up as a coil or stored as a rod product.

advantageous designs, Details and features of the invention will become apparent from the dependent claims and the following description of the embodiments according to the invention in conjunction with the drawings for the solution according to the invention.

following Now, the invention with reference to an embodiment in conjunction closer with three figures explained become.

It show:

1 : The device according to the invention for the production of metal composite pipes in the side view, (section AA according to 2 );

2 : the device according to the invention for the production of metal composite pipes in plan view;

3 : The device according to the invention for the production of metal composite pipes in plan view with the upstream and downstream in the production line modules.

In the 1 the device according to the invention for the production of metal composite pipes is shown in section in the side view.

On a base frame 1 is the tape feed 2 , a tape forming device 3 and a combined inner tube extrusion tool 4 with a leading into the middle of the tube compressed gas supply 5 and one of the band forming device 3 In the manufacturing direction adjacent arranged welding device 6 and one in the direction of manufacture after the welding device 6 arranged shape stabilization device 7 ,

Between the band forming device 3 and the shape stabilizing device 7 is in the area of the welding device 6 According to the invention, a calibration sleeve 8th arranged.

The calibration head 9 of the inner tube extrusion tool 4 is in front of a sizing holder 21 attached calibration sleeve 8th arranged. The at the calibration head 9 arranged compressed gas outlet 10 protrudes inside through the calibration sleeve 8th almost to the area of the shape stabilization device 7 ,

By means of the inner tube extrusion tool 4 According to the invention a on the outer circumference with adhesion promoter 11 coated plastic tube 12 in the after the inner tube extrusion tool 4 Calibration sleeve arranged according to the invention 8th extruded into it.

In the interior of the calibration sleeve according to the invention 8th becomes the diameter and ovality of the extruded plastic tube 12 calibrated to one of the respective to be manufactured nominal size corresponding measure.

At the same time but on the outer jacket of the calibration sleeve according to the invention 8th the supplied metal strip is formed into a tube and on the Kalibrierhülse 8th welded.

Now the metal band 13 formed into a tube and on the calibration sleeve 8th metal pipe 14 is welded, that is with a bonding agent 12 coated within the calibration sleeve according to the invention 8th calibrated plastic pipe 11 from the calibration sleeve ( 8th ) directly into the outer jacket of the calibration sleeve ( 8th ) welded in the direction of production leaving the same production speed welded metal pipe ( 14 ) introduced.

With the help of compressed gas which from the invention after the calibration 8th arranged compressed gas outlet 10 into the interior of the plastic pipe 11 The plastic pipe will now exit 11 from the inside to the metal tube 14 pressed.

It now comes to a reaction between the plastic pipe 11 and the metal tube 14 arranged adhesion promoter 12 whereby the plastic tube is firmly connected via the adhesive layer with the metal tube.

In the production direction is the shape stabilization device 7 adjacent a combined sheathing tool 18 downstream. As a result, the internally coated metal composite pipe 15 be provided with a minimal energy input also with an outer plastic coating.

The 2 now shows the inventive device for the production of metal composite pipes from the 1 in the plan view.

On the base frame 1 is the tape feed 2 , the band forming device 3 and a combined inner tube extrusion tool 4 with a leading into the middle of the tube compressed gas supply 5 , in the production direction strip forming device 3 adjacent arranged welding device 6 and in the manufacturing direction after the welding device 6 arranged shape stabilization device 7 ,

Between the band forming device 3 and the shape stabilizing device 7 is in the area of the welding device 6 on a calibration sleeve holder 21 the calibration sleeve 8th arranged.

The shape stabilizing device 7 is adjacent in the manufacturing direction a combined sheathing tool 18 arranged so that the initially internally coated metal composite pipe 15 can also be provided with an outer plastic coating.

In the 3 the device according to the invention for the production of metal composite pipes is shown in plan view with the upstream and downstream assemblies in the production line.

From a tape preparation 22 The metal strip is first by means of a tape feed 2 preformed and as already explained between the band forming device 3 and the belt stabilization device 7 by means of a welding device 6 on the calibration sleeve according to the invention 8th welded, while at the same time and with the same production speed by means of a combined inner tube extrusion tool 4 (With an arranged on this adhesion promoter unit 16 and an inner tube extrusion unit also disposed thereon 17 ) According to the invention coated on the outer circumference with a primer plastic tube in the calibration 8th extruded into it.

In the production direction after the shape stabilization device 7 is still a combined sheathing tool 18 with a connected thereto Außenrohrhaftvermittlereinheit 19 and also on the sheathing tool 18 connected outer tube extruder unit 20 arranged so that on this production line a provided with an outer plastic coating metal composite pipe can be made. This is then from a provided for example with a printer tape hood 24 through a cooling section 23 withdrawn through. Finally, the metal composite pipe thus produced is placed on a winder 25 wound up and is thus ready to ship as a coil.

With the solution according to the invention succeeded in a device for the production of metal composite pipes to develop which are the disadvantages of the current state of the art avoids and makes it possible Metal composite pipes with minimized technical and energetic Effort with high quality and at high production speed to produce and thereby the plant also in the shortest time Time and with minimal effort on every other pipe dimension to be produced convert.

Claims (4)

Device for producing metal composite pipes with a strip feed ( 2 ), a base frame ( 1 ), one on the base frame ( 1 ) arranged strip molding device ( 3 ) and at least one of these opposite to the direction of production adjacent inner tube extrusion tool ( 4 ) with a leading into the tube center compressed gas supply ( 5 ) as well as one in the production direction of the strip forming device ( 3 ) adjacent welding device ( 6 ) and one in the production direction after the welding device ( 6 ) arranged shape stabilization device ( 7 ), characterized in that between the belt molding device ( 3 ) and the shape stabilization device ( 7 ) in the area of the welding device ( 6 ) a calibration sleeve ( 8th ) is arranged, wherein calibration head ( 9 ) of the inner tube extrusion tool ( 4 ) in front of the calibration sleeve ( 8th ) and the compressed gas outlet ( 10 ) through the calibration sleeve ( 8th ) and the calibration head ( 9 ) into the area of the shape stabilization device ( 7 ) protrudes. Apparatus for the production of metal composite pipes according to claim 1, characterized in that as Innenrohrextrusionswerkzeug ( 4 ) a combined inner tube extrusion tool ( 4 ) with an inner tube bonding unit ( 16 ) and an inner tube extruder unit ( 17 ) is used. Apparatus for the production of metal composite pipes according to claim 1, characterized in that in the manufacturing direction adjacent to the shape stabilization device ( 7 ) at least one wrapping tool ( 18 ) is arranged. Apparatus for producing metal composite pipes according to claim 3, characterized in that the sheathing tool ( 18 ) as a combined cladding tool ( 18 ), with an outer tube bonding unit ( 19 ) and an outer tube extruder unit ( 20 ), is trained.